Step clip fastening system



FIG. 1 is a front, top and right side perspective view of a step clip fastening system showing my new design;

FIG. 2 is an enlarged partial view of the front, top and right side perspective view thereof;

FIG. 3 is a front plan view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is an enlarged partial view of a front, right side view thereof; and,

FIG. 6 is an enlarged partial view of a front, left side view thereof. 

CLAIM The ornamental design for a step clip fastening system, as shown and described. 